ofEvents: initialize member vars, destructors.

- Set initial/default values for ofEvents.
~~- ofTouchArgs: Changed tapCount -> numTaps to be similar to mouse events~~
- ofTouchArgs: Added `frame`.
- ofTouchArgs: Changed `time` type to match `ofGetTimeElapsedMillis()`
- ofTouchArgs: Added device id.
- ofMouseArgs: added clickCount
- ofMouseArgs: added deviceId, frame, time, etc.
- implemented click counter